JOSH TICKELL is one of the nation's leading experts on alternative fuels and the author of From the Fryer to the Fuel Tank (2003) and Biodiesel America: How to Achieve Energy Security, Free America from Middle-East Oil Dependence and Make Money Growing Fuel (2006). In 1997, after obtaining a Master of Fine Arts in film from Florida State University, Tickell drove across the country in a diesel Winnebago (dubbed "The Veggie Van") fueled by used frying oil from fast food restaurants. He also began working on a documentary to chronicle and raise awareness about biodiesel and the green energy movement. The feature-length film, Fields of Fuel, has been winning awards at festivals around the country, including the Audience Award at Sundance, and is scheduled to be released nationwide in September. The film features appearances by Woody Harrelson, Larry Hagman, Neil Young, Willie Nelson, and other notable celebrities and cultural icons. In addition to consulting for various environmental companies and organizations and speaking at colleges and universities in the United States and abroad, Tickell is the founder of the Biodiesel America Organization, which was selected in 2005 by former President Bill Clinton to be part of his Global Initiative on Climate Change. The Humanist caught up with Tickell in July to talk about U.S. energy policy, alternative fuel, and his growing reputation as "that biodiesel guy." The Humanist: I understand you're in the final phase of post-production on your documentary Fields of Fuel. Tell us a bit about the film and your experience making it.